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(C) Colchicine is a poisonous chemical, isolated from the seeds and bulbs of the autumn crocus $(Colchicum)$ $autumnale$.It blocks spindle fiber forma

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Colchicine

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(C) Colchicine is a poisonous chemical, isolated from the seeds and bulbs of the autumn crocus $(Colchicum)$ $autumnale$.It blocks spindle fiber formation during cell division and thus inhibits the movement of sister chromatids to the opposite poles.The resulting restitution nucleus includes all the chromatids.As a result, the chromosome number of the cell is doubled, which leads to polyploidy.

Column-$I$	Column-$II$
$a.$ Ethephon	$(i)$ $GA$
$b.$ Terpene	$(ii)$ Ethylene
$c.$ Zeatin	$(iii)$ Natural auxin
$d.$ $IAA$	$(iv)$ Cytokinin

Polyploidy can be induced by the application of

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Column-$I$ Column-$II$
$a.$ Ethephon $(i)$ $GA$
$b.$ Terpene $(ii)$ Ethylene
$c.$ Zeatin $(iii)$ Natural auxin
$d.$ $IAA$ $(iv)$ Cytokinin

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